Fix all the inconsistent nve_os* function declarations and definitions in nve(4).  The OS_API structure defined in os.h expects NV_API_CALL attributes, effectively regparm(0), on its function pointers, but all the functions were declared and defined without this attribute.
Fix all the inconsistent nve_os* function declarations and definitions
in nve(4).  The OS_API structure defined in os.h expects NV_API_CALL
attributes, effectively regparm(0), on its function pointers, but all
the functions were declared and defined without this attribute.

MFC after:	1 week

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